Spin torque oscillator with low magnetic moment and high perpendicular magnetic anisotropy material

a spin torque oscillator and high perpendicular magnetic anisotropy technology, applied in the field of spin torque oscillators, can solve the problems of unstable magnetic oscillation behavior, weak ac magnetic field, low efficiency, etc., and achieve the effect of reducing the magnetic moment and large effective perpendicular magnetic anisotropy field

Active Publication Date: 2016-06-28
WESTERN DIGITAL TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The T-mode oscillation utilizes reflect torque, which has low efficiency.
However, anti-parallel magnetization directions may partially cancel the magnetizations in the SPL and FGL, leading to weak AC magnetic field and unstable magnetization oscillation behavior.

Method used

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  • Spin torque oscillator with low magnetic moment and high perpendicular magnetic anisotropy material
  • Spin torque oscillator with low magnetic moment and high perpendicular magnetic anisotropy material
  • Spin torque oscillator with low magnetic moment and high perpendicular magnetic anisotropy material

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Embodiment Construction

[0017]In the following, reference is made to embodiments. However, it should be understood that the disclosure is not limited to specific described embodiments. Instead, any combination of the following features and elements, whether related to different embodiments or not, is contemplated to implement and practice the disclosure. Furthermore, although embodiments of the disclosure may achieve advantages over other possible solutions and / or over the prior art, whether or not a particular advantage is achieved by a given embodiment is not limiting of the disclosure. Thus, the following aspects, features, embodiments and advantages are merely illustrative and are not considered elements or limitations of the appended claims except where explicitly recited in a claim(s).

[0018]Embodiments disclosed herein generally relate to a magnetic disk device employing a MAMR head. The MAMR head includes an STO. The STO comprises an underlayer, an SPL, an interlayer, an FGL, and a capping layer. Th...

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Abstract

Embodiments disclosed herein generally relate to a magnetic disk device employing a MAMR head. The MAMR head includes an STO. The STO comprises an underlayer, an SPL, an interlayer, an FGL, and a capping layer. The SPL is comprised of a high perpendicular magnetic anisotropy material. The SPL has a large effective perpendicular magnetic anisotropy field, and the SPL has a lower magnetic moment than the FGL. An applied current is adapted to flow in a direction from the FGL to the SPL resulting in the magnetization direction of the SPL being almost perpendicular to the FGL and anti-parallel to a head-gap magnetic field due to a relation between a first spin torque directed from the SPL to the FGL and a second spin torque directed from the FGL to the SPL.

Description

BACKGROUND[0001]1. Field[0002]Embodiments disclosed herein generally relate to a magnetic disk device employing a microwave assisted magnetic recording (MAMR) head.[0003]2. Description of the Related Art[0004]Over the past few years, MAMR has been studied as a recording method to improve the areal density of a magnetic read / write device, such as a hard disk drive (HDD). MAMR enabled magnetic recording heads utilize a spin torque oscillator (STO) for generating a microwave (high frequency AC magnetic field). When the magnetic field from the write head is applied and current is conducted to the STO, the STO oscillates and may provide an AC magnetic field to the medium. The AC magnetic field may reduce the coercive force of the recording medium, thus high quality recording by MAMR may be achieved. Typically the STO includes a spin polarization layer (SPL), a field generation layer (FGL) and an interlayer disposed between the SPL and the FGL. The STO generates high frequency magnetic fi...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): G11B5/31G11B5/35G11B5/00
CPCG11B5/35G11B2005/0024G11B5/314G11B5/607G11B5/00
Inventor NAGASAKA, KEIICHISATO, YOSATO, MASASHIGEOKAMURA, SUSUMUSHIIMOTO, MASATOIGARASHI, MASUKAZU
Owner WESTERN DIGITAL TECH INC
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